JPH046122B2 - - Google Patents
Info
- Publication number
- JPH046122B2 JPH046122B2 JP61151624A JP15162486A JPH046122B2 JP H046122 B2 JPH046122 B2 JP H046122B2 JP 61151624 A JP61151624 A JP 61151624A JP 15162486 A JP15162486 A JP 15162486A JP H046122 B2 JPH046122 B2 JP H046122B2
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- frequencies
- monopole antenna
- antenna element
- inverted
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000005404 monopole Effects 0.000 claims description 22
- 239000002184 metal Substances 0.000 claims description 5
- 239000012212 insulator Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Aerials (AREA)
Description
【発明の詳細な説明】
［発明の技術分野］
本発明は、例えば地下街の天井等に設置され、
近接した２つの周波数を共用するアンテナ装置に
関する。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a system that is installed, for example, on the ceiling of an underground mall,
The present invention relates to an antenna device that shares two adjacent frequencies.
［従来技術とその欠点］
第７図に従来の２波共用アンテナを示す。この
アンテナは、共用する２波のうち、低い方の周波
数（fL）に用いる逆Ｌ状の折返し２線式モノポー
ルアンテナ素子１１と、このアンテナ素子１１の
基部周囲に配置された高い方の周波数（fH）に用
いる円筒状アンテナ素子１２と、これらアンテナ
素子１１及び１２における信号を合成し整合を行
なう整合回路１３とから成る。上記各アンテナ素
子１１，１２及び整合回路１３は、絶縁物１４に
より一体化され、アース板１５の面上に設置され
る。この２波共用アンテナにおける共用周波数
は、上記fLに対してfHが約2.4倍あるいは3.1倍と
いうように大きく離れている。[Prior Art and Its Disadvantages] FIG. 7 shows a conventional dual-wave antenna. This antenna consists of an inverted L-shaped folded two-wire monopole antenna element 11 used for the lower frequency (f L ) of two shared waves, and a higher monopole antenna element 11 arranged around the base of this antenna element 11. It consists of a cylindrical antenna element 12 used for frequency (f H ), and a matching circuit 13 that combines signals in these antenna elements 11 and 12 and performs matching. The antenna elements 11 and 12 and the matching circuit 13 are integrated by an insulator 14 and installed on the surface of a ground plate 15. The shared frequency in this two-wave shared antenna is far apart, such that fH is approximately 2.4 times or 3.1 times as large as fL .
ここで、共用周波数が例えばfL≒360MHz、fH
≒470MHzというように、約1.3倍の近接した周波
数である場合、インピーダンスがそれぞれの周波
数fL、fHにおいて互いに影響し合い、整合が複雑
で困難になる。この場合、調整範囲の広い新たな
整合回路が必要となり、コスト高になる欠点が有
る。また、アンテナ自体の小型化を目的とし、ア
ース板１５からのfL用アンテナ素子１１のアンテ
ナ高を低くしたい場合にも、fH用アンテナが同軸
状構造を有するため、製作が複雑になり、コスト
高になる欠点が有る。 Here, the shared frequencies are, for example, f L ≒ 360MHz, f H
When the frequencies are approximately 1.3 times closer, such as ≈470 MHz, the impedances influence each other at the respective frequencies f L and f H , making matching complicated and difficult. In this case, a new matching circuit with a wide adjustment range is required, which has the disadvantage of increasing costs. Furthermore, even if the antenna height of the f L antenna element 11 from the ground plate 15 is to be lowered for the purpose of downsizing the antenna itself, the f H antenna has a coaxial structure, which makes manufacturing complicated. It has the disadvantage of high cost.
［発明の目的］
本発明は上記のような問題点に鑑みなされたも
ので、近接した２つの周波数を共用周波数とする
場合でも、整合回路を必要とせずに良好な特性が
得られ、しかも低アンテナ高としても同軸状構造
と取ることのない、ローコスト化が可能なアンテ
ナ装置を提供することを目的とする。[Object of the Invention] The present invention has been made in view of the above-mentioned problems. Even when two adjacent frequencies are used as a common frequency, good characteristics can be obtained without the need for a matching circuit, and the present invention can also achieve low performance. It is an object of the present invention to provide an antenna device that does not require a coaxial structure in terms of antenna height and can be reduced in cost.
［発明の要点］
すなわち本発明に係わるアンテナ装置は、低い
周波数用の逆Ｌ状折返し形モノポールアンテナ
と、この低周波数用のモノポールアンテナと同一
の給電点を有する高い周波数用の逆Ｌ状モノポー
ルアンテナとを組合わせて構成し、簡単な構造で
近接する２つの周波数を共用可能としたものであ
る。[Summary of the Invention] That is, the antenna device according to the present invention includes an inverted L-shaped folded monopole antenna for low frequencies, and an inverted L-shaped folded monopole antenna for high frequencies that has the same feeding point as the monopole antenna for low frequencies. It is configured in combination with a monopole antenna, making it possible to share two nearby frequencies with a simple structure.
［発明の実施例］
以下図面を参照して本発明の一実施例を説明す
る。[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings.
第１図はその外観斜視構成を示すもので、同図
において、２１は低い方の周波数fLに用いる逆Ｌ
状の折返し２線式モノポールアンテナ素子、２２
は高い方の周波数fHに用いる逆Ｌ状モノポールア
ンテナ素子である。このfL用アンテナ素子２１と
fH用アンテナ素子２２とは、それぞれ180°開いた
状態でその垂直部が密着一体化され、金属体のア
ンテナ素子基部２３に立設固定される。そして、
このアンテナ素子基部２３を、絶縁碍子２４を介
し、アース板２５に対して絶縁固定さる。上記fH
用アンテナ素子２２には、その定在波比特性を向
上させる目的で、逆Ｌ状水平部に金属板２２ａを
付加する。 Figure 1 shows its external perspective configuration. In the figure, 21 is an inverted L used for the lower frequency f L.
folded two-wire monopole antenna element, 22
is an inverted L-shaped monopole antenna element used for the higher frequency f H . This f L antenna element 21 and
The fH antenna element 22 is closely integrated with the vertical portion thereof in a 180° open state, and is erected and fixed to the antenna element base 23 made of a metal body. and,
This antenna element base 23 is insulated and fixed to a ground plate 25 via an insulator 24. Above f H
A metal plate 22a is added to the inverted L-shaped horizontal portion of the antenna element 22 for the purpose of improving its standing wave ratio characteristics.
ここで、上記各アンテナ素子２１，２２の給電
部は、アース板２５の裏面に突出する後述の給電
用接栓２６を同一の給電部として導出され、また
アース板２５表面上のアンテナ素子部は、後述の
絶縁カバー２７により覆われる。 Here, the power feeding portions of each of the antenna elements 21 and 22 are derived from a power feeding plug 26, which will be described later, protruding from the back surface of the ground plate 25, as the same power feeding portion, and the antenna element portion on the surface of the ground plate 25 is , covered by an insulating cover 27, which will be described later.
すなわち、上記構成のアンテナ装置では、fL用
アンテナ素子２１及びfH用アンテナ素子２２それ
ぞれの給電垂直部を密着一体化し、さらにfH用ア
ンテナ素子２２には金属板２２ａを付加したの
で、高周波数fHにおいて良好な定在波比特性が得
られるようになる。また、fH用アンテナ素子２１
とfH用アンテナ素子２２とを、それぞれ180°開い
た状態で設置したので、高周波数fHにおける垂直
偏波水平面指向性の偏差を少なくできる。つま
り、fH用素子として同軸状構造のアンテナ素子を
用いずとも、簡単な構造の逆Ｌ状モノポールアン
テナ素子２２で、良好な特性が得られるようにな
る。 That is, in the antenna device having the above configuration, the vertical feed portions of the f L antenna element 21 and the f H antenna element 22 are closely integrated, and the metal plate 22a is added to the f H antenna element 22, so that the height can be reduced. Good standing wave ratio characteristics can be obtained at the frequency fH . In addition, f H antenna element 21
and f H antenna element 22 are installed in a 180° open state, so that deviations in vertically polarized horizontal plane directivity at high frequency f H can be reduced. In other words, good characteristics can be obtained with the simple structure of the inverted L-shaped monopole antenna element 22 without using a coaxially structured antenna element as the fH element.
第２図は、共用周波数をそれぞれfL＝360MHz、
fH＝466.5MHz（約1.3倍）とした場合の本アンテ
ナ装置の構成例を示すもので、各アンテナ素子２
１及び２２の図示寸法は、周波数fLあるいはfHに
て電気長に換算したものを示している。fL及びfH
用のアンテナ素子２１，２２及びその他の構成部
品は、周波数fLにて直径約1.2λのアース板２５に
取付けられ、裏面中央部には給電用接栓２６が設
けられ、アンテナ側は絶縁カバー２７により覆わ
れる。 Figure 2 shows the shared frequencies f L = 360MHz,
This shows an example of the configuration of this antenna device when f H = 466.5MHz (approximately 1.3 times), and each antenna element 2
The illustrated dimensions 1 and 22 are converted into electrical lengths at the frequency f L or f H. f L and f H
The antenna elements 21, 22 and other components are attached to a ground plate 25 with a diameter of approximately 1.2λ at the frequency f L , a power supply plug 26 is provided in the center of the back side, and an insulating cover is provided on the antenna side. covered by 27.
第３図、第４図及び第５図は、それぞれ上記第
２図におけるアンテナ装置に周波数fLにて約2.4λ
×2.4λのアース板２５を使用した場合の水平面指
向特性及び定在波比特性を示している。第３図、
第４図から明らかなように、垂直偏波水平面指向
特性については、fLにおいて無指向性、fHにおい
て±2.5dB程度の偏差特性が実現できる。また、
第５図から明らかなように、電圧定在波比特性に
ついては、fL及びfHの何れにおいても1.5以下とい
う非常に良好な特性を得ることができ、特に、fL
では定在波比1.5以下が高範囲に亙つている。 3, 4, and 5 each show the antenna device in FIG. 2 above at a frequency f L of approximately 2.4λ.
The horizontal plane directivity characteristics and standing wave ratio characteristics are shown when a ground plate 25 of ×2.4λ is used. Figure 3,
As is clear from FIG. 4, regarding the vertically polarized horizontal plane directivity characteristics, omnidirectionality can be achieved at f L and deviation characteristics of about ±2.5 dB can be achieved at f H. Also,
As is clear from Fig. 5, very good voltage standing wave ratio characteristics can be obtained, with both f L and f H being 1.5 or less, especially f L
In this case, the standing wave ratio is 1.5 or less over a high range.
したがつて、上記構成のアンテナ装置によれ
ば、整合回路を用いない簡単な構造で良好な水平
面指向特性及び定在波比特性が得られるようにな
り、低いアンテナ高でローコスト化が実現でき
る。 Therefore, according to the antenna device having the above configuration, good horizontal directivity characteristics and standing wave ratio characteristics can be obtained with a simple structure that does not use a matching circuit, and low cost can be realized with a low antenna height.
尚、第６図はアンテナ高を0.05λとしたfL用ア
ンテナ素子３１を用いた場合の本アンテナ装置の
構成例を示すもので、ここでは、インピーダンス
の実数部が小さくなり整合困難になるのを防ぐた
め、逆Ｌ状折返し３線式のモノポールアンテナ素
子３１を使用する。この場合のfL及びfHの周波数
比は、fL用アンテナ素子における高周波成分の影
響を考慮すると、1.3〜３倍程度が適当である。 Furthermore, Fig. 6 shows an example of the configuration of this antenna device when using an f L antenna element 31 with an antenna height of 0.05λ. In order to prevent this, an inverted L-shaped folded three-wire monopole antenna element 31 is used. In this case, the appropriate frequency ratio of f L and f H is about 1.3 to 3 times, considering the influence of high frequency components in the f L antenna element.
また、上記実施例では、共用周波数fL＝360M
Hz、fH＝466.5MHzとした場合について述べたが、
他の周波数においても、その周波数に逆比例させ
た相似形に製作することにより、上記と略同等の
アンテナ特性を得ることができる。 In addition, in the above embodiment, the shared frequency f L =360M
I mentioned the case where Hz, f H = 466.5MHz,
At other frequencies, substantially the same antenna characteristics as above can be obtained by manufacturing a similar shape that is inversely proportional to the frequency.
［発明の効果］
以上のように本発明によれば、低い周波数用の
逆Ｌ状折返し形モノポールアンテナと、この低周
波数用のモノポールアンテナと同一の給電点を有
する高い周波数用の逆Ｌ状モノポールアンテナと
を組合わせて構成し、簡単な構造で近接する２つ
の周波数を共用可能としたので、整合回路を必要
とせずに良好な特性が得られ、しかも低アンテナ
高としても同軸状構造を取ることのない、ローコ
スト化が可能なアンテナ装置を提供できる。[Effects of the Invention] As described above, according to the present invention, there is an inverted L-shaped folded monopole antenna for low frequencies, and an inverted L shaped monopole antenna for high frequencies that has the same feeding point as the monopole antenna for low frequencies. It is configured by combining a shaped monopole antenna and can share two adjacent frequencies with a simple structure, so good characteristics can be obtained without the need for a matching circuit.Moreover, even with a low antenna height, it is possible to use a coaxial antenna. It is possible to provide an antenna device that does not require a structure and can be reduced in cost.
第１図は本発明の一実施例に係わるアンテナ装
置を示す外観斜視構成図、第２図は上記アンテナ
装置の共用周波数をfL＝360MHz、fH＝466.5MHz
とした場合の各部の寸法を示す図、第３図は上記
第２図におけるアンテナ装置のfLでの水平面指向
特性を示す図、第４図は上記第２図におけるアン
テナ装置のfHでの水平面指向特性を示す図、第５
図は上記第２図におけるアンテナ装置のfL及びfH
それぞれの電圧定在波比特性を示す図、第６図は
fL用アンテナ素子のアンテナ高をさらに低くした
場合のアンテナ装置を示す外観斜視構成図、第７
図は従来の２波共用アンテナを示す構成図であ
る。
２１，３１……fL用アンテナ素子、２２……fH
用アンテナ素子、２２ａ……金属板、２３……ア
ンテナ素子基部、２４……絶縁碍子、２５……ア
ース板、２６……給電用接栓、２７……絶縁カバ
ー。
FIG. 1 is an external perspective configuration diagram showing an antenna device according to an embodiment of the present invention, and FIG. 2 shows the shared frequencies of the antenna device, f L = 360 MHz, f H = 466.5 MHz.
Figure 3 is a diagram showing the horizontal plane directivity characteristics at f L of the antenna device in Figure 2 above, and Figure 4 is a diagram showing the dimensions of each part of the antenna device in Figure 2 above at f H. Diagram showing horizontal plane directivity characteristics, 5th
The figure shows f L and f H of the antenna device in Figure 2 above.
Figure 6 shows the voltage standing wave ratio characteristics of each
f External perspective configuration diagram showing the antenna device when the antenna height of the L antenna element is further lowered, No. 7
The figure is a configuration diagram showing a conventional dual-wave antenna. 21, 31...f L antenna element, 22...f H
22a...Metal plate, 23...Antenna element base, 24...Insulator, 25...Earth plate, 26...Power supply plug, 27...Insulating cover.
Claims (1)
置において、 低い周波数用の逆Ｌ状折返し形モノポールアン
テナと、 この低周波数用のモノポールアンテナと同一の
給電点を有し該低周波数用のモノポールアンテナ
とは180°開いた状態で設置される高い周波数用の
逆Ｌ状モノポールアンテナと、 この高周波数用のモノポールアンテナの逆Ｌ状
水平部に沿つて付加された金属板と、 上記低周波数用のモノポールアンテナと高周波
数用のモノポールアンテナとがその同一給電点に
絶縁物を介して取付けられるアース板と、 を具備したことを特徴とするアンテナ装置。[Claims] 1. An antenna device that shares two adjacent frequencies, comprising: an inverted L-shaped folded monopole antenna for low frequencies; and an antenna having the same feeding point as the monopole antenna for low frequencies; A monopole antenna for low frequencies is an inverted L-shaped monopole antenna for high frequencies that is installed in a 180° open state, and a monopole antenna for high frequencies that is attached along the inverted L-shaped horizontal part of the monopole antenna for high frequencies. An antenna device comprising: a metal plate; and a ground plate to which the low-frequency monopole antenna and the high-frequency monopole antenna are attached to the same feeding point via an insulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61151624A JPS639206A (en) | 1986-06-30 | 1986-06-30 | Antenna system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61151624A JPS639206A (en) | 1986-06-30 | 1986-06-30 | Antenna system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS639206A JPS639206A (en) | 1988-01-14 |
| JPH046122B2 true JPH046122B2 (en) | 1992-02-04 |
Family
ID=15522612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61151624A Granted JPS639206A (en) | 1986-06-30 | 1986-06-30 | Antenna system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS639206A (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2507038B2 (en) * | 1989-04-19 | 1996-06-12 | 松下電器産業株式会社 | Wireless antenna device |
| JP2548490Y2 (en) * | 1990-11-08 | 1997-09-24 | 株式会社本田電子技研 | Antenna device |
| JP2851265B2 (en) * | 1996-02-23 | 1999-01-27 | ユニデン株式会社 | Antenna for wireless communication equipment |
| DE10050902A1 (en) * | 2000-10-13 | 2002-04-25 | Alcatel Sa | Antenna arrangement for mobile phones |
| JP2002185238A (en) * | 2000-12-11 | 2002-06-28 | Sony Corp | Dual band compatible built-in antenna device and portable wireless terminal equipped with the same |
| JP2004129062A (en) * | 2002-10-04 | 2004-04-22 | Sharp Corp | Frequency sharing antenna |
| CN1765030B (en) * | 2003-04-28 | 2010-05-26 | 胡贝尔和茹纳股份公司 | Broadband Antenna Set |
| JP2005094198A (en) | 2003-09-16 | 2005-04-07 | Denso Corp | Antenna device |
| US7388550B2 (en) * | 2005-10-11 | 2008-06-17 | Tdk Corporation | PxM antenna with improved radiation characteristics over a broad frequency range |
| JP4643624B2 (en) * | 2007-09-21 | 2011-03-02 | 株式会社東芝 | ANTENNA DEVICE AND ELECTRONIC DEVICE |
| JP4945672B2 (en) * | 2010-09-15 | 2012-06-06 | 株式会社東芝 | Electronics |
-
1986
- 1986-06-30 JP JP61151624A patent/JPS639206A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS639206A (en) | 1988-01-14 |
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